/Engine/Plugins/Experimental/Mutable/Source/MutableRuntime/Public/MuR/System.h
Only valid between BeginUpdate and EndUpdate Calculate the description of an image, without generating it.
void GetImageDesc ( [Instance::ID](API\Plugins\MutableRuntime\MuR\Instance\ID) InstanceID, FResourceID ImageId, [FImageDesc](API\Plugins\MutableRuntime\MuR\FImageDesc) & OutDesc )